Material Drying
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PA12 Moisture Content 0.1% Critical Value Management
Problem Phenomenon
【Problem phenomenon】PA12 products intermittently showed bubbles and water marks, clearly related to the length of time after bag opening
Cause Analysis
The moisture content of surface pellets of PA12 left for a long time after bag opening can exceed the 0.1% critical value; moisture must be below 0.1% before processing, otherwise bubbles, water marks, and property decline occur; both Viewmold and EMS materials take 0.1% as the red line
Solution
Use up opened material within a time limit, and transfer leftover material to a sealed metal container; material exposed beyond the time limit should be re-dried according to specifications; establish a bag-opening time registration and moisture content sampling inspection system; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
0.1% is the life-and-death line for PA12 moisture, and bag-opening time management determines moisture content; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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